<template>
  <view>
    <my-search @click="gotoSearch"></my-search>
    <view class="scroll-view-container">
      <scroll-view class="left-scroll-view" scroll-y :style="{height: wh+'px'}">
        <block v-for="(item,i) in cateList" :key="i">
          <view :class="['left-scroll-view-item', i===active?'active':'']"
          @click="activeChange(i)"
          >
          {{item.cat_name}}
          </view>
        </block>
      </scroll-view>
      <scroll-view  
      class="right-scroll-view" scroll-y 
      :style="{height: wh + 'px'}"
      :scroll-top="scrollTop">
        <view class="cate-lv2" v-for="(item2,i2) in cateLevel2" :key="i2">
          <view class="cate-lv2-title">/{{item2.cat_name}}/</view>
          <view class="cate-lv3-list">
            <view class="cate-lv3-item" 
            v-for="(item3,i3) in item2.children" :key="i3"
            @click="gotoGoodsList(item3)">
              <image :src="item3.cat_icon.replace('dev','web')"></image>
              <text>{{item3.cat_name}}</text>
            </view>
          </view>
        </view>
      </scroll-view>
    </view>
  </view>
</template>

<script>
  import badgeMix from '@/mixins/tabbar-badge.js'
  export default {
    mixins: [badgeMix],
    data() {
      return {
        // 当前设备可用高度
        wh:0,
        cateList:[],
        active:0,
        // 二级分类列表
        cateLevel2:[],
        scrollTop:0
      }
    },
    onLoad(){
       const sysInfo = uni.getSystemInfoSync()
      this.wh = sysInfo.windowHeight-50
      this.getCateList()
    },
    methods:{
      async getCateList(){
        const {data:res} =await uni.$http.get('/api/public/v1/categories')
        if(res.meta.status!== 200)  return uni.$showMsg()
        this.cateList=res.message
        this.cateLevel2=res.message[0].children
        uni.$showMsg('数据请求成功！')
      },
      activeChange(i){
        this.active=i
        this.cateLevel2=this.cateList[i].children
        this.scrollTop=this.scrollTop===0?1:0
      },
      gotoGoodsList(item3){
        uni.navigateTo({
          url:'/subpkg/goods_list/goods_list?cid='+ item3.cat_id
        })
      },
      gotoSearch() {
           uni.navigateTo({
             url: '/subpkg/search/search'
           })
         }
    }
  }
</script>

<style lang="scss">
.scroll-view-container{
  display: flex;
}
.left-scroll-view{
  width: 120px;
  .left-scroll-view-item{
    background-color: #f7f7f7;
    line-height: 60px;
    text-align: center;
    font-size: 12px;
    
    &.active{
      background-color: #ffffff;
      position: relative;
      
      &::before{
        content: '';
        display: block;
        width: 3px;
        height: 30px;
        background-color: #c00000;
        position: absolute;
        top: 50%;
        left: 0;
        transform: translateY(-50%);
      }
    }
  }
}

.cate-lv2-title {
  font-size: 12px;
  font-weight: bold;
  text-align: center;
  padding: 15px 0;
}
.cate-lv3-list {
  display: flex;
  flex-wrap: wrap;

  .cate-lv3-item {
    width: 33.33%;
    margin-bottom: 10px;
    display: flex;
    flex-direction: column;
    align-items: center;

    image {
      width: 60px;
      height: 60px;
    }

    text {
      font-size: 12px;
    }
  }
}
</style>
